plot density on map

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Autor: Mike Starke
Data:  
Assunto: plot density on map
I am wondering if anyone can direct me to either
some software or a web site that functions much
like http://maps.yahoo.com

I would like to query my database for the address and zip,
and have it plot a 'dot' on a valley map (or map for any city)
for each entry.

v/r
-Mike